title: Cloning, expression and map assignment of chicken prosaposin.
abstract: Prosaposin is the precursor of four small glycoproteins, saposins A-D, that activate lysosomal sphingolipid hydrolysis. A full-length cDNA encoding prosaposin from chicken brain was isolated by PCR. The deduced amino acid sequence predicted that, similarly to human and other mammalian species studied, chicken prosaposin contains 518 residues, including four domains that correspond to saposins A-D. There was 59% identity and 76% similarity of human and chicken prosaposin amino acid sequences. The basic three-dimensional structures of these saposins is predicted to be similar on the basis of the conservation of six cysteine residues and an N-glycosylation site. Identity of amino acid sequences was higher among saposins A, B and D than in saposin C. The predicted amino acid sequence of saposin B matched exactly that of purified chicken saposin B protein. The chicken prosaposin gene was mapped to a single locus, PSAP, in chicken linkage group E11C10 and is closely linked to the ACTA2 locus. This confirms the homology between chicken and human prosaposins and defines a new conserved segment with human chromosome 10q21-q24.
authors.affiliation: University of California, San Diego, Department of Neurosciences, Center for Molecular Genetics, 0634J, La Jolla, CA 92093, USA.
authors.forename: N
authors.initials: N
authors.lastname: Azuma
authors.forename: H C
authors.initials: HC
authors.lastname: Seo
authors.forename: O
authors.initials: O
authors.lastname: Lie
authors.forename: Q
authors.initials: Q
authors.lastname: Fu
authors.forename: R M
authors.initials: RM
authors.lastname: Gould
authors.forename: M
authors.initials: M
authors.lastname: Hiraiwa
authors.forename: D W
authors.initials: DW
authors.lastname: Burt
authors.forename: I R
authors.initials: IR
authors.lastname: Paton
authors.forename: D R
authors.initials: DR
authors.lastname: Morrice
authors.forename: J S
authors.initials: JS
authors.lastname: O'Brien
authors.forename: Y
authors.initials: Y
authors.lastname: Kishimoto
mesh_terms: D000199:Actins / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002645:Chickens / Q000235:genetics*; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D008040:Genetic Linkage; D006023:Glycoproteins / Q000235:genetics*; D006801:Humans; D008099:Liver / Q000201:enzymology; D051379:Mice; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic; D051381:Rats; D049231:Saposins; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D000199:Actins; D006023:Glycoproteins; C483345:PSAP protein, human; C483344:Psap protein, mouse; C483347:Psap protein, rat; D049231:Saposins